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Operation Teardrop

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Operation Teardrop
Part of the Battle of the Atlantic, World War II
An inflatable raft on the water with four camouflaged World War II-era warships behind it. No land is visible.
A liferaft carrying survivors from U-546 in the midst of a group of U.S. Navy destroyer escorts on April 24, 1945
DateApril–May 1945
Location
North Atlantic Ocean
Result United States victory
Belligerents
 Germany  United States
Commanders and leaders
Nazi Germany Eberhard Godt United States Jonas H. Ingram
Strength
7 submarines 4 aircraft carriers,
42 destroyers
Casualties and losses
218 killed,
unknown wounded,
33 captured,[1]
5 submarines sunk		 126 killed,
unknown wounded,
1 destroyer sunk

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Template:FixBunching Operation Teardrop was a United States Navy operation of World War II conducted during April and May 1945 to sink German U-boats that were believed to be approaching the United States east coast armed with V-1 flying bombs. Two large U.S. Navy anti-submarine warfare task forces succeeded in destroying five of the boats, for the loss of one destroyer escort. After the war the Allies determined that the submarines were not carrying missiles.

Operation Teardrop was planned during late 1944 in response to intelligence reports which indicated that Germany was preparing a force of missile-armed submarines. The plan was executed in April 1945 after several Type IX submarines put to sea from Norway bound for the the United States. While severe weather conditions in the North Atlantic Ocean greatly reduced the effectiveness of the four U.S. Navy escort carriers involved, long patrol lines of destroyer escorts successfully detected and engaged most of the German submarines. Four of the submarines engaged were sunk with the loss of their entire crew. Most of the crew of the other submarine to be sunk were captured, with the specialists among the prisoners being brutally interrogated. In exchange, USS Frederick C. Davis was sunk with the loss of most of her crew. The surviving U-boats surrendered to the U.S. Navy in early May as part of the general German surrender.

Background

In late 1944, the Allies received intelligence reports which suggested that the German Navy was planning to use V-1 flying bombs launched from submarines to attack cities on the east coast of the United States. In September that year, Oscar Mantel, a spy captured by the U.S. Navy when the submarine transporting him to Maine was sunk, told his Federal Bureau of Investigation interrogators that several missile-equipped U-boats were being readied. United States Tenth Fleet analysts subsequently examined photos of unusual mountings on U-boats at bases in Norway, but concluded that they were wooden tracks used to load torpedoes. Further rumors of missile-armed submarines emerged later that year, including one from Sweden passed on by the Supreme Headquarters Allied Expeditionary Force. The British Admiralty discounted these reports, and assessed that while V-1s could be potentially mounted on Type IX submarines, the Germans were unlikely to devote scarce resources to such a project.[2]

A grey rocket on a camouflaged ramp in front of a hedge. The tops of houses and street lights are visible behind the hedge.
A V-1 on a launch rail at Imperial War Museum Duxford

Despite the Tenth Fleet and Admiralty assessments, the U.S. military and government remained concerned that Germany would conduct vengeance attacks against east coast cities. In early November 1944, the Eastern Sea Frontier mounted an intensive search for submarines within 250 miles (400 km) of New York City.[3] In early December 1944 the spies William Curtis Colepaugh and Eric Gimpel, who had been captured in New York City after being landed by U-1230 in Maine, told their interrogators that Germany was preparing a group of rocket-equipped submarines. On December 10 the Mayor of New York City, Fiorello La Guardia, publicly warned that Germany was considering an attack on New York with long-ranged rockets. La Guardia's warning and the claims made by the captured spies received considerable media coverage.[4] Despite this, the Department of War, which was dominated by the Army, advised President Franklin D. Roosevelt on December 11 that the threat of missile attack was so low that it did not justify the diversion of resources from other tasks. This assessment was not supported by the U.S. Navy.[3]

In response to the perceived threat, the United States Atlantic Fleet prepared a plan to defend the east coast from attacks by aerial raiders and missiles. This plan was originally code-named 'Operation Bumblebee', and later renamed 'Operation Teardrop'. Completed on January 6, 1945, the plan involved U.S. Navy anti-submarine forces as well as United States Army Air Forces (USAAF) and United States Army units, which were responsible for shooting down attacking aircraft and missiles. The centerpiece of the plan was the formation of two large naval task forces to operate in the mid-Atlantic as a barrier against submarines approaching the east coast. These task forces were formed from several existing escort carrier groups, and used Argentia, Newfoundland as their forward operating base. As well as guarding against missile attacks, these large forces were tasked with countering the new and high-performance Type XXI submarines if they began operating in the central Atlantic. The Atlantic Fleet's commander, Vice Admiral Jonas H. Ingram, gave a press conference on January 8 in which he warned there was a threat of missile attack and announced that a large force had been assembled to counter seaborne missile launchers.[5]

In January 1945, German Minister of Armaments and War Production Albert Speer made a propaganda broadcast in which he claimed that V-1 and V-2s "would fall on New York by February 1, 1945", increasing the U.S. Government's concern over the threat of attack.[6] However, the Germans had no ability to fire missiles from their submarines, as both attempts to develop submarine-launched rockets ended in failure. In June 1942, U-511 was used to trial small and short-ranged artillery rockets which could be fired while submerged. Development of this system ended in early 1943, as it was found to decrease the U-boats' seaworthiness.[7] The German military also began the development of a U-boat-towed launch canister for the V-2 ballistic missile in November 1944. Once complete, these canisters were to be towed to a position off the U.S. east coast and be used to attack New York. Vulkan Docks in Stettin was contracted to build a prototype in March or April 1945 but little work took place before Germany's final collapse. It is unlikely that the system would have been successful if it had been completed.[8]

Battle

Initial deployments

A World War II-era aircraft carrier at anchor. Several aircraft are on her flight deck and land and buildings are visible in the background.
USS Croatan anchored in the Hudson River off New York City in October 1945

Nine Type IX U-boats were dispatched from Norway to patrol off Canada and the United States in March 1945. On April 12, U-518, U-546, U-805, U-858, U-880, U-881 and U-1235 were designated "Gruppe Seewolf" and ordered to attack shipping from New York southwards. The remaining two boats, U-530 and U-548, were directed to Canadian waters.[9] The purpose of this deployment was to "annoy and defy the United States".[10]

The Allies were aware of this force's departure and destination through information gathered from Enigma decrypts. Vice Admiral Ingram and the U.S. Tenth Fleet concluded that the boats in Gruppe Seewolf were carrying V-1s and launched Operation Teardrop in response.[11] The ships of the First Barrier Force, which comprised escort carriers USS Mission Bay and USS Croatan and twenty destroyer escorts, sortied from Hampton Roads between March 25 and 27, proceeded to Argentia to refuel and assembled east of Cape Race on April 11. Twelve of the destroyer escorts deployed into a line 120 miles (190 km) long while the two carriers, each protected by four destroyer escorts, sailed to the west of the line. The carriers' air operations were, however, greatly hindered by heavy seas.[12] The rough weather also forced the cancellation of planned memorial services for President Roosevelt after his death on April 12.[13]

As it sailed west, Gruppe Seewolf was ordered to attack shipping by U-boat Command. The boats found no targets, however, as the Allies had routed convoys to the south to avoid the submarines and severe weather.[11] The German submarines began to reach their initial stations east of the Grand Banks of Newfoundland on April 8. U-Boat Command assigned Gruppe Seewolf a dozen different scouting lines between April 2 and 19. The radio signals directing these deployments were decrypted by the Allies, providing them with accurate information on where the boats were operating.[14]

First Barrier Force actions

Just before midnight on April 15, USS Stanton made radar contact with U-1235 at a position about 500 miles (800 km) north of Flores Island. She immediately attacked the submarine with her hedgehog anti-submarine mortar, but missed as the submarine submerged. Assisted by USS Frost, Stanton quickly gained sonar contact with the submarine and made three more hedgehog attacks. The third attack, which was conducted at 0033 on April 16, sank the submarine with the loss of her entire crew. Shortly afterwards Frost detected U-880 by radar as she attempted to flee the area on the surface. After illuminating the submarine with star shell and spotlights, the destroyer escort opened fire on her with Bofors 40 mm guns from a range of 650 yards (590 m) at 0209. U-880 quickly submerged but was tracked by Stanton’s and Frost’s sonar operators. The two American ships made several hedgehog attacks on the submarine, with Stanton sinking her with no survivors at 0404.[15] Both submarines suffered huge explosions after being struck by hedgehog projectiles. This further raised the fear that they were carrying rockets and motivated the First Barrier Force to intensify its efforts to destroy the remaining U-boats.[16]

The First Barrier Force maneuvered south westward following the destruction of U-1235 and U-880. Leigh light-equipped B-24 Liberators from VPB-114 spotted U-805 on the surface during the nights of April 18 and 19. The submarine was only 50 miles (80 km) from Mission Bay and her escorts, but was not attacked as the aircraft couldn't confirm whether she was hostile before she submerged. On the night of April 20, U-546 attempted to torpedo a U.S. destroyer escort, but missed. The following night U-805 was detected by USS Mosley, but escaped after being depth charged by Mosley, USS Lowe and USS J.R.Y. Blakely for two hours.[17]

The First Barrier Force scored its final success on the night of April 21/22. Just before midnight USS Carter detected U-518 with sonar. USS Neal A. Scott joined her and made the initial hedgehog attack on the submarine. Following this Carter made her own hedgehog run, which sank U-518 with no survivors.[18] By this time the First Barrier Force was returning to Argentia, after the Second Barrier Force relieved it.[19]

Second Barrier Force actions

The Second Barrier Force comprised escort carriers USS Bogue and USS Core and twenty two destroyer escorts. Bogue and ten destroyer escorts had sailed from Quonset on April 16, while Core and twelve destroyer escorts sailed from Bermuda and other locations.[20] The force was initially stationed along the 45th meridian in a patrol line 105 miles (169 km) long, and sailed towards the east.[19] This line was made up of 14 destroyer escorts sailing at 5 miles (8.0 km) intervals, with Core and her four escorts at its northern end and Bogue and her four escorts at the southern end.[20]

On the night of April 22/23, U-boat Command dissolved Gruppe Seewolf and directed the three surviving boats to take up stations between New York and Halifax. Shortly afterwards, U-881, U-889 and U-1229, which had been operating separately, were also ordered to positions between New York and Cape Hatteras. Radio signals directing these deployments were decrypted by Allied code breakers and increased fears that the submarines were trying to attack American cities.[19]

The Second Barrier Force encountered its first U-boat on April 23 when a TBF Avenger from VC-19 sighted U-881 about 74 miles (119 km) north west of Bogue just after noon. The aircraft dropped depth charges, but did not seriously damage the submarine. This was the first attack made by an aircraft during Operation Teardrop.[21] The next day U-546 sighted Core and maneuvered to attack the escort carrier.[22] She attempted to pass through the barrier line but was detected by USS Frederick C. Davis at 0830, which immediately prepared to attack the submarine. After realizing that his boat had been detected U-546’s commander, Kapitänleutnant Paul Just, fired a T-5 acoustic torpedo at the destroyer escort from a range of 650 yards (590 m). Frederick C. Davis’ foxer decoy was not effective, and the torpedo struck her forward engine room at 0835. She sank five minutes later with the loss of all but 66 of her 192 crewmen.[21][23] Eight American destroyer escorts subsequently hunted U-546 for almost ten hours before USS Flaherty severely damaged her with a hedgehog salvo. The submarine immediately surfaced, but sank after Flaherty and three or four other destroyer escorts fired at it. Kapitänleutnant Just and 32 other crewmen survived the sinking and were taken prisoner.[22]

A bearded man wearing a white jumper walking towards the camera along a narrow walkway while holding on a railing. Water is visible below the walkway and a large number of men wearing dark clothes are either passing in the opposite way or watching the bearded man.
Kapitänleutnant Just comes aboard USS Bogue after being rescued

Some of U-546’s survivors were harshly treated in an attempt to force them to divulge whether the submarines bound for the U.S. east coast were carrying missiles. After brief interviews on board Bogue, the survivors were transferred to the U.S. base at Argentia. Upon arrival on April 27 the prisoners were screened for interrogation, with eight specialists being separated from the other 25 survivors, who were then sent to prisoner of war camps. The specialists were held in solitary confinement and subjected to "shock interrogation" techniques, exhausting physical exercise and beatings. On April 30, Kapitänleutnant Just provided brief information on Gruppe Seewolf's composition and mission following a second interview in which he collapsed unconscious. The information provided by Just and the other specialists did not mention whether the submarines were equipped with missiles. The eight men were transferred to Fort Hunt, Virginia shortly after VE Day, where they continued to be harshly treated until Just agreed to write an account of U-546’s history on May 12.[24] Historian Philip K. Lundeberg has written that the beating and torture of U-546’s survivors was a "singular atrocity" motivated by the interrogators' need to promptly extract information on potential missile attacks.[22]

The Second Barrier Force slowly moved south west from April 24, searching for the remaining U-boats. USS Swenning made radar contact with a submarine on the night of April 24, but it escaped during the resulting search. After a week of searching south of the Newfoundland Banks, the barrier force was split on May 2 to provide greater depth. The Mission Bay group reinforced the Second Barrier Force during this period, bringing its strength to three escort carriers and thirty one destroyer escorts.[25]

U-881 became the fifth and final U-boat to be sunk during Operation Teardrop on May 5. The boat was detected while attempting to pass submerged through the barrier line by USS Farquhar shortly before daybreak. The destroyer escort immediately turned to starboard and dropped depth charges, which sank the submarine with no survivors at 0616. U-881 was the last German submarine to be sunk by the U.S. Navy during World War II.[26]

Aftermath

The Second Barrier Force established its final barrier line along the 60th meridian on May 7. Following the end of World War II in Europe, it accepted the surrender of U-234, U-805, U-858 and U-1228 at sea before returning to bases on the U.S. east coast.[27]

The U.S. Navy continued its efforts to determine whether the U-boats had been carrying missiles after the German surrender. The crews of U-805 and U-858 were interrogated and confirmed that their boats were not fitted with missile launching equipment.[28] Kapitänleutnant Fritz Stienhoff, who had commanded U-511 during her rocket trials and was captured at sea when he surrendered U-873, was subjected to an abusive interrogation at Portsmouth by the interviewers of U-546’s crew. An official navy investigation was held into this interrogation after Stienhoff committed suicide at Charles Street Jail in Boston shortly afterwards. It is not known if the Allies were aware of Stienhoff's involvement in the rocket trials.[28][29]

A rocket taking off horizontally from the deck of a surfaced World War II-era submarine
A Loon being fired from USS Cusk in 1951

The tactics used in Operation Teardrop were evaluated by U.S. Navy officers after the war. The escort carriers' air wings were disappointed with their experience, as their ability to detect submarines was hampered by severe weather throughout the operation. Despite this, the aircraft were successful in forcing the U-boats to remain submerged, thereby greatly slowing their speed.[28] Other after action reports stressed the importance of teamwork between destroyer escorts when attacking submarines and argued that single barrier lines such as those used throughout most of Operation Teardrop were inferior to grouping ships in assigned patrol areas.[30] Nevertheless, Philip K. Lundeberg has assessed the operation as "a classic demonstration not only of coordinated hunter tactics, derived in part from British experience, but also of the profound impact of communications intelligence in the interdiction of U-boat transit and operating areas."[31]

A variant of the V-1 was used by the U.S. Navy to test the feasibility of launching missiles from submarines in the years after World War II. Republic-Ford JB-2 "Loon" missiles were launched from USS Cusk and USS Carbonero in a series of tests which began on February 12, 1947. These tests were successful, and led to the development of further submarine-launched cruise missiles.[32] The U.S. Navy's success in adapting a variant of the V-1 to be launched from submarines also demonstrated that it would have been technically feasible for the German Navy to have done the same.[33]

Notes

Wikimedia Commons has media related to Operation Teardrop.
  1. ^ Blair (1998), p. 688
  2. ^ Lundeberg (1994), pp. 213–215
  3. ^ a b Siegel (1989), p. 33
  4. ^ Lundeberg (1994), p. 215
  5. ^ Lundeberg (1994), pp. 215–216
  6. ^ Blair (1998), p. 683
  7. ^ Lundeberg (1994), pp. 213–214
  8. ^ Neufeld (1995), p. 255
  9. ^ Blair (1998), pp. 686–687
  10. ^ Morison (1956), p. 345
  11. ^ a b Blair (1998), p. 686
  12. ^ Lundeberg (1994), p. 216
  13. ^ Morison (1956), p. 346
  14. ^ Lundeberg (1994), p. 217
  15. ^ Lundeberg (1994), p. 218
  16. ^ Morison (1956), p. 349
  17. ^ Lundeberg (1994), p. 219
  18. ^ Lundeberg (1994), pp. 219–220
  19. ^ a b c Lundeberg (1994), p. 220
  20. ^ a b Morison (1956), p. 350
  21. ^ a b Morison (1956), p. 351
  22. ^ a b c Blair (1998), p. 687
  23. ^ Lundeberg (1994), pp. 221–222
  24. ^ Lundeberg (1994), pp. 224–225
  25. ^ Lundeberg (1994), pp. 225–226
  26. ^ Lundeberg (1994), p. 226
  27. ^ Y'Blood (2004), p. 272
  28. ^ a b c Lundeberg (1994), p. 227
  29. ^ Blair (1998), pp. 689–690
  30. ^ Lundeberg (1994), p. 229
  31. ^ Lundeberg (1994), p. 230
  32. ^ Polmar and Moore (2004), p. 87
  33. ^ Duffy (2004), p. 72

References

  • Blair, Clay (1998). Hitler's U-Boat War. The Hunted, 1942 – 1945 (Modern Library ed.). New York: Random House. ISBN 0679640339.
  • Duffy, James P. (2004). Target America: Hitler's plan to attack the United States. Santa Barbara: Greenwood Publishing Group. ISBN 0275966844.
  • Lundeberg, Philip K. (1994). "Operation Teardrop Revisited". In Runyan, Timothy J. and Copes, Jan M (ed.). To Die Gallantly : The Battle of the Atlantic. Boulder: Westview Press. ISBN 0813388155.{{cite book}}: CS1 maint: multiple names: editors list (link)
  • Morison, Samuel Eliot (2001) [1956]. The Atlantic Battle Won May 1943 — May 1945. History of United States Naval Operations in World War II, Vol. 10 (Castle Books ed.). Edison: Castle Books. ISBN 078581311X.
  • Neufeld, Michael J. (1995). The Rocket and the Reich. Peenemünde and the Coming of the Balistic Missile Era. New York: The Free Press. ISBN 0029228956.
  • Polmar, Norman (2004). Cold War submarines: the design and construction of U.S. and Soviet submarines (Illustrated ed.). Herndon: Brassey’s. ISBN 1574885944. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  • Siegel, Adam B. (1989). "The Wartime Diversion of U.S. Navy Forces in Response to Public Demands for Augmented Coastal Defense". Alexandria: Center for Naval Analysis. {{cite web}}: |access-date= requires |url= (help); Missing or empty |url= (help)
  • Y'Blood, William T. (2004). Hunter-killer: U.S. escort carriers in the Battle of the Atlantic (Illustrated ed.). Annapolis: Naval Institute Press. ISBN 1591149959.
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